Trunk for a motorcycle



FIG. 1 is a front perspective view of a trunk for a motorcycle showing my new design;

FIG. 2 is a front view;

FIG. 3 is a rear view;

FIG. 4 is a top view;

FIG. 5 is a bottom view;

FIG. 6 is a left side view;

FIG. 7 is a front perspective view with the lid in open condition; and,

FIG. 8 is a front perspective view with the motorcycle and attached base plate shown in plate lines for illustrative purposes only and forming no part of the claimed design. 

The ornamental design for a trunk for a motorcycle, as shown and described. 